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- Oppressed Group: Schizoid, A Personality, Not a Disorder: An essay defending the position that SPD is not a valid mental disorder.
- A comprehensive overview of SPD with many references.
- Schizoid (Yahoo!Groups) - A group for people who have schizoid personality disorder or who have some of its traits (welcome message)
- Sula Wolff, Beyond Asperger Syndrome Links between SPD, Asperger syndrome and schizophrenia